#include <stdio.h>
#define square(x) ((x) * (x))
#define MAX(x,y) ((x) > (y) ? (x) : (y))

int main(void)
{
	   printf("Max between 20 and 10 is %d\n", MAX(10, 20));  
	   printf("%d\n",square(4));
	      return 0;
}
